php - ClassName::class 在 PHP 中是什么意思？

Question

这个问题在这里已经有了答案:

What is ::class in PHP? (4 个回答)

关闭 去年。

当我阅读用 Laravel 框架编写的代码时，我看到了很多 ClassName::class 的用法。修饰符::class是什么意思？这是 Laravel 还是 PHP 的特性？我已搜索但找不到文档。

Answer 1

Since PHP 5.5, the class keyword is also used for class name resolution. You can get a string containing the fully qualified name of the ClassName class by using ClassName::class. This is particularly useful with namespaced classes.

例如

namespace MyProject;
class Alpha{ }

namespace MyOtherProject;
class Beta{ }

echo Alpha::class; // displays: MyProject\Alpha
echo Beta::class; // displays: MyOtherProject\Beta